Make python code collapsible:

- Remove unused code: https://github.com/getpelican/pelican-plugins/issues/140
- Add javascript and CSS to header to toggle code areas
- load jinja2 template from file
add jinja2 template file to have collapsible python code
Merge branch 'master' into collapse-code
remove unnessecary replace from template, require white space after hash
get jquery via https from google's cdn
Maintain backward compatibility by not requiring that pelicanhtml is copied to the blog home
Explain new collapsible code cells feature in Readme.md
Added plugin: pelican comment system
Merge pull request #185 from Scheirle/master

Added plugin: Pelican Comment System
[pelican_comment_system] Added Recommendation
Merge pull request #188 from Scheirle/master

[pelican_comment_system] Add recommendation
[pelican_comment_system] Added Avatars and Identicons
[pelican_comment_system] Added comment feeds
[pelican_comment_system] made python3 compatible
Merge pull request #190 from Scheirle/master

[pelican_comment_system] Added Avatars, Identicons and Comment Atom Feed
Add the Creole Reader plugin
Add dependency information.
Merge pull request #195 from Jenselme/creole_reader

Add a plugin to read the wikicreole syntax.
Creole reader: add source code highlighting support.

Correct typo.
Liquid Tags: line numbers for include_code